I'm belatedly installing my dual extruder kit on my Metal Plus 1412 w/ F5 PBoard, and have come across a 2 pin jumper with black and white wires attached to what looks like a little glass diode. No idea where it goes, and we all know how good PB is at documentation, the instructions are long gone from the website and customer service auto-replies that my purchase is too old for a reply, so I have not been able to find the install document.

Anyone know where this should go? There's also a chance that it came with my Heated bed kit or the Ubis hot end?